What are the reasons for the shrinkage of school uniform fabrics

Updated:17-09-2019
Summary:

The shrinkage rate of fabrics in primary and secondary […]

The shrinkage rate of fabrics in primary and secondary schools refers to the shrinkage rate of fabrics after washing or soaking. Shrinkage refers to the phenomenon that the length or width of a textile changes after washing, dehydrating, and drying in a certain state. The degree of shrinkage involves various fibers, fabric structures, different external forces acting on the fabric during processing, and the shrinkage of synthetic fibers and blended fabrics is minimal, followed by wool, linen, and cotton fabrics, and the shrinkage of silk is greater. The largest are viscose, rayon and faux wool fabrics.

The primary and secondary school clothing fabrics have different yarn counts and shrinkage rates. The shrinkage of the spun yarn is large, and the shrinkage of the spun fabric is small. The shrinkage of the fabric varies with the production process. Generally speaking, in the textile dyeing and finishing process, the fiber needs to be stretched multiple times, the processing time is long, the fabric with large tension has a large shrinkage rate, and the fabric with a large tension has a small shrinkage rate. Natural plant fibers (such as cotton, hemp) and regenerated plant fibers (such as viscose) are more likely to absorb and swell than synthetic fibers (such as polyester, acrylic), and have higher shrinkage, while wool is easier to felt due to the scale structure of the fiber surface. Hehe. Rs that affect its dimensional stability.

In general, the dimensional stability of the uniform woven fabric is superior to that of the knitted fabric, and the dimensional stability of the high-density fabric is superior to that of the low-density fabric. In general, the plain weave fabric has a smaller shrinkage ratio than the flannel fabric, and the knitted fabric has a smaller shrinkage ratio than the ribbed fabric. Since the fabric is inevitably mechanically stretched during the dyeing and finishing process, tension is present on the fabric. However, the fabric tends to release tension when it is in contact with water, so we will find that the fabric shrinks after washing. In actual production, the pre-shrinking method is usually used to solve this problem. Washing care includes washing, drying and ironing. Each of these three steps affects the shrinkage of the fabric. For example, the dimensional stability of hand-washed samples is better than machine-washed samples, and the washing temperature also affects dimensional stability. In general, the higher the temperature, the worse the stability. The drying method of the sample also has a great influence on the shrinkage of the fabric.

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